Almarza de Cameros is a village and municipality in the province and autonomous community of La Rioja, in northern Spain. It lies within the Cameros comarca, a mountainous area of the Iberian System south of the Ebro valley.
The municipality covers an area of 28.11 square kilometres (10.85 square miles). As of 2011 its population was 23 people, making it one of the smallest and most sparsely populated municipalities in La Rioja.